1、BRITISH STANDARD Optical fibres Part 1-46: Measurement methods and test procedures - Monitoring of changes in optical transmittance The European Standard EN 60793-146:2002 has the status ofa British Standard ICs 33.180.10 BS EN 60793-1 -46: 2002 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED
2、BY COPYRIGHT LAW BS EN 60793-14612002 Amd.No. National foreword Date Comments This British Standard, having been prepared under the direction of the Electrotechnical Sector Policy and Strategy Committee, was published under the authority of the Standards Policy and Strategy Committee on 23 May 2002
3、This British Standard is the official English language version of EN 60793-146:2002. It is identical with IEC 60793-146:2001. It partly supersedes BS EN 188000:1994 which will be withdrawn upon publication of the full BS EN 60793-1 series of standards. The UKparticipation in its preparation was entr
4、usted by Technical Committee GEL/86, Fibre optics, to Subcommittee GEL/86/1, Optical fibres and cables, which has the responsibility to: - - aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change,
5、 and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. - A list of organizations represented on this subcommittee can be obtained on request to its secretary. From 1 January 1997, all IEC publications have the number 60000 added to
6、 the old number. For instance, IEC 27-1 has been renumbered as IEC 60027-1. For a period oftime during the change over from one numbering system to the other, publications may contain identifiers from both systems. Cros s-r e ferenc es The British Standards which implement international or European
7、publications referred to in this document may be found in the BSI Standards Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Find” facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include all the necessary
8、 provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not ofitself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2
9、to 12, an inside back cover and a back cover. The BSI copyright date displayed in this document indicates when the document was last issued. O BSI 23 May 2002 ISBN O 580 39705 X EUROPEAN STANDARD NORME EUROPENNE EN 60793-1 -46 ICs 33.180.10 Partly supersedes EN 188000:1992 English version Optical fi
10、bres Part 1-46: Measurement methods and test procedures - Monitoring of changes in optical transmittance (IEC 60793-1-46:2001) Fibres optiques Partie 1-46: Mthodes de mesure et procdures dessai - Contrle des variations du facteur de transmission optique (CE1 60793-1 -4612001) Lichtwellen lei ter Tei
11、l 1-46: Messmethoden und Prfverfahren - berwachung der optischen bertragu ngsnderu ngen (IEC 60793-1 -4612001) This European Standard was approved by CENELEC on 2001-07-03. CENELEC members are bound to comply with the CENKENELEC Internal Regulations which stipulate the conditions for giving this Eur
12、opean Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CENELEC member. This European Standard exists in three official versions (En
13、glish, French, German). A version in any other language made by translation under the responsibility of a CENELEC member into its own language and notified to the Central Secretariat has the same status as the official versions. CENELEC members are the national electrotechnical committees of Austria
14、, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechni
15、que Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35. B - 1050 Brussels O 2002 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members Ref. No. EN 60793-1-46:2002 E Page 2 EN 60793-1-462002 Foreword The text of
16、document 86A/675/FDIS, future edition 1 of IEC 60793-1-46, prepared by SC 86A, Fibres and cables, of IEC TC 86, Fibre optics, was submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as EN 60793-1-46 on 2001-07-03. This European Standard supersedes subclause 4.27 (test method 31 6)
17、 and subclause 4.28 (test method 317) of EN 188000:1992. The following dates were fixed: - latest date by which the EN has to be implemented at national level by publication of an identical national standard or by endorsement - latest date by which the national standards conflicting with the EN have
18、 to be withdrawn (dop) 2002-09-01 (dow) 2004-07-01 Annexes designated “normative“ are part of the body of the standard. In this standard, annexes A, B and ZA are normative. Annex ZA has been added by CENELEC. Compared to IEC 60793-1:1989 and IEC 60793-2:1992, IEC/SC 86A has adopted a revised structu
19、re of the new IEC 60793 series: The individual measurement methods and test procedures for optical fibres are published as “Part 1-XX“; the product standards are published as “Part 2-XX“. The general relationship between the new series of EN 60793 and the superseded European Standards of the EN 1880
20、00 series is as follows: EN EN 60793-1-XX EN 60793-2-XX Title Optical fibres - Part 1-XX: Measurement methods and test Drocedures Optical fibres - Part 2-XX: Product specifications supersedes Individual subclauses of EN 188000:1992 EN 188100:1995 EN 188101:1995 EN 188102:1995 EN 188200:1995 EN 18820
21、1:1995 EN 188202:1995 EN 60793-1-4X consists of the following parts, under the general title: Optical fibres: - - - - - - - Part 1-40: Measurement methods and test procedures -Attenuation Part 1-41: Measurement methods and test procedures - Bandwidth Part 1-42: Measurement methods and test procedure
22、s -Chromatic dispersion Part 1-43: Measurement methods and test procedures - Numerical aperture Part 1-44: Measurement methods and test procedures - Cut-off wavelength Part 1-45: Measurement methods and test procedures - Mode field diameter Part 1-46: Measurement methods and test procedures - Monito
23、ring of changes in optical transmittance Part 1-47: Measurement methods and test procedures - Macrobending loss Part 1-48: Measurement methods and test procedures - Under consideration Part 1-49: Measurement methods and test procedures - Under consideration - - - Endorsement notice The text of the I
24、nternational Standard IEC 60793-1-46:2001 was approved by CENELEC as a European Standard without any modification. O BSI 23 May 2002 Page 3 EN 60793-1-462002 CONTENTS INTRODUCTION . 4 . 5 5 Reference test method Apparatus . 5 5.1 Specimen length . . 6 5.2 Specimen end face . 6 5.4 Reference specimen
25、 6 Procedure . 6 Results . 6 8.1 Information to be provided with each measurement 6 8.2 Information available upon request . 6 Sampling and specimens . Specification information . 7 Annex A (normative) Requirements specific to method A - Change in transmittance by Annex B (normative) Requirements sp
26、ecific to method B - Change in transmittance b 11 Annex ZA (normative) Normative references to international publications with their corresponding European publications 12 transmitted power . 8 backscattering Figure A.l - Measurement of change in optical transmittance using reference specimen .9 Fig
27、ure A.2 - Measurement of change in optical transmittance using stabilized source 9 O BSI 23 May 2002 Page 4 EN 60793-1-462002 INTRODUCTION Publications in the IEC 60793-1 series concern measurement methods and test procedures as they apply to optical fibres. Within the same series several different
28、areas are grouped, as follows: - parts 1-10 to 1-19: General - parts 1-20 to 1-29: Measurement methods and test procedures for dimensions - parts 1-30 to 1-39: Measurement methods and test procedures for mechanical character ist ics - parts 1-40 to 1-49: Measurement methods and test procedures for t
29、ransmission and optical character ist ics - parts 1-50 to 1-59: Measurement methods and test procedures for environmental character ist ics . O BSI 23 May 2002 Page 5 EN 60793-1-462002 OPTICAL FIBRES - Part 1-46: Measurement methods and test procedures - Monitoring of changes in optical transmittanc
30、e 1 Scope This part of IEC 60793 establishes uniform requirements for the monitoring of changes in optical transmittance, thereby assisting in the inspection of fibres and cables for commercial purposes. This standard gives two methods for monitoring the changes in optical transmittance of optical f
31、ibres and cables that occur during mechanical or environmental testing, or both. It provides a monitor in the change of optical transmission characteristics arising from optical discontinuity, physical defects and modifications of the attenuation slope: - method A: change in transmittance by transmi
32、tted power; - method B: change in transmittance by backscattering. Methods A and B apply to the monitoring of all categories of the following fibres: - class A: multimode fibres; - class B: single-mode fibres. Information common to both measurements is contained in clauses 1 to 8, and information pe
33、rtaining to each individual method appears in annexes A, and B respectively. 2 Normative references The following normative documents contain provisions which, through reference in this text, constitute provisions of this International Standard. For dated references, subsequent amendments to, or rev
34、isions of, any of these publications do not apply. However, parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the norm
35、ative document referred to applies. Members of IEC and IS0 maintain registers of currently valid International Standards. IEC 60793-1-40, Opfical fibres - Parf 1-40: Measuremenf mefhods and fesf procedures - Affenuafion 3 Reference test method Under consideration. 4 Apparatus Annexes A and B include
36、 layout drawings and other equipment requirements that individually apply for each of the methods, respectively. O BSI 23 May 2002 Page 6 EN 60793-1-462002 5 Sampling and specimens 5.1 Specimen length The minimum length of the specimen shall be such that the changes in attenuation are compatible wit
37、h the resolution of the measurement apparatus, and the non-linearities at the beginning and end of it shall not affect the results. 5.2 Specimen end face Prepare a flat end face, orthogonal to the fibre axis, at the input and output ends of each specimen. 5.3 Specimen preparation Prepare the specime
38、n as described in the appropriate mechanical, environmental, or other test method specified. 5.4 Reference specimen In methods where a reference specimen is used, it shall comprise an identical kind of optical fibre or cable to the specimen and shall be linked between the optical divider and detecto
39、r, as shown in figure A.1. It may be a short length of fibre. The condition of the reference specimen shall be constant during the whole test. 6 Procedure For individual procedures, see annexes A and B for methods A and B, respectively. 7 Calculations For calculation procedures, see the appropriate
40、annex: A and B, respectively. 8 Results 8.1 Report the following information with each measurement: - date and title of measurement; - identification of specimen; - optical source wavelength, A; - specimen length; - conditions of the environment and measurement equipment; - changes in optical transm
41、ittance, D,; 7 = 1,2,3, . preferably plotted in a graph versus test parameters. Information to be provided with each measurement 8.2 Information available upon request The following information shall be available upon request: - measurement method used: A or B; - type of optical source used and its
42、spectral width (FWHM); O BSI 23 May 2002 Page 7 EN 60793-1-462002 - launching technique used; - description of all key equipment; - details of computation technique; - date of latest calibration of measurement equipment. 9 Specification information The detail specification shall specify the followin
43、g information: - type of fibre to be measured; - failure or acceptance criteria; - information to be reported; - any deviations from the procedure that apply. O BSI 23 May 2002 Page 8 EN 60793-1-462002 Annex A (norm at ive) Requirements specific to method A - Change in transmittance by transmitted p
44、ower A.l Apparatus A. 1.1 General The arrangement shall provide a monitoring for optical transmittance with high resolution and good stability over the time and temperature changes given in the relevant product specification. Figure A.l is an example of a typical arrangement suitable for use when ca
45、rrying out mechanical or environmental tests in a laboratory or factory. By comparison with a reference sample, it provides a measurement of the change in optical transmittance, corrected for any changes that might occur in the optical source. Connections shall have stable coupling conditions. Figur
46、e A.2 is an example of a typical arrangement suitable for use in the field, laboratory or factory where long-term tests are required, in cases where it is possible to stabilize the optical source by optical feedback. If the stability of the optical source is compatible with the accuracy needed for t
47、he measurement, then the insertion loss measurement method (method B of IEC 60793-1-40) may be used. A.1.2 Optical source Use an suitable source such as a laser or light-emitting diode, emitting at wavelengths compatible with the optical fibres under test. It is customary to modulate the optical sou
48、rce and wavelength selective optical filters may be used. A.1.3 Optical divider The optical divider shall have a splitting ratio that remains constant during the test. The splitting ratio and temperature stability shall be as shown in the relevant detail specification. Commercially available or cust
49、om built devices may be used. A.1.4 Optical detector The optical detector shall be of sufficient area to intercept all of the radiated power in the output cone and shall be sufficiently linear over the optical powers encountered. O BSI 23 May 2002 Page 9 EN 60793-1-462002 Optical source L I I -7- Figure A.l - Measurement of change in optical transmittance using reference specimen L Detectors - Stabilized optical source - r- I Test environment I I l l I I l I I 1 Detector Launching system I I I Test specimen 1 I L- - - _ - _ - _I I 11 IEC 705101 Recorder Amp
